head porting

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Jmaloy, considering the cams lift, some head work would help. The valve job is responsible for flow to approx. a .400 lift and then the heads port becomes more important after that. A typical street porting would be very good here IMO. If the heads are stock, and you do not mind upgrading valves, I myself would be looking at;

New stainless valves w/a valve job of course. Porting under the valve, the bowl area and upwards a bit including a good touching up of the short side radius of the port. Gasket matching is a plus but only a small one that doesn't hurt.
This, will add a noticable improvement. Not huge, but noticable.

Dvorak is a very worthy place to travel to.
 
moper said:
Stupid questions are those unasked.
Given the other parts - I'd think there's probably something else that's holding you back too. So I'd do some careful inspection if the heads are coming off anyway. Who spec'd the custom cam and is the valve job quality there? Reason I ask is I've used a Crane hydraulic with a similar intake lobe and made a lot more hp on a stock piston 440 with my ported 516 heads and a 6bbl.
Porting will help. It helped my 100% stock Neon and pretty much anything else it's done one. Assuming that the rest of the engine package is matched well and in good order and the porting is of good quality. The valve job can do a lot of what basic porting does if it's done with the right equipment by someone who wants to do a good job. It will also enhance any port work you pay for. So there may be more to getting more power than just porting. Make sure the rings are sealing (leakdown) and have the heads gone through a the same time. Then work with the head porter to match a new cam choice to what you have.
Click to expand...
Yeah that's the case sometimes. It just doesnt come off as it being the exhaust system that is responsibleas to why this thing isn't making more then mid 400's. Even seeing "triys"...lol..love the way some type, and that cam, speaking of which was ground with those in mind I'm thinking.

You hit it imo and I just caught it like the Tri Y thing, "2.14/1.81" .....wonder how much was blended, or not.
Bigger valves need bowl work flow well and or at least a good throat cut to not go the other direction ...that can be a killer.
 
moper said:
Stupid questions are those unasked.
Given the other parts - I'd think there's probably something else that's holding you back too. So I'd do some careful inspection if the heads are coming off anyway. Who spec'd the custom cam and is the valve job quality there? Reason I ask is I've used a Crane hydraulic with a similar intake lobe and made a lot more hp on a stock piston 440 with my ported 516 heads and a 6bbl.
Porting will help. It helped my 100% stock Neon and pretty much anything else it's done one. Assuming that the rest of the engine package is matched well and in good order and the porting is of good quality. The valve job can do a lot of what basic porting does if it's done with the right equipment by someone who wants to do a good job. It will also enhance any port work you pay for. So there may be more to getting more power than just porting. Make sure the rings are sealing (leakdown) and have the heads gone through a the same time. Then work with the head porter to match a new cam choice to what you have.
Click to expand...
ray barton race ing. spec the cam to my truck (tire size, gear ratio, weight, ing size,
ing built by local builder no head work other than valve job was done that I know of (only one head man in the area he was sick could not get to them at the time of build) I chose the triy headers for the trq potential. when it goes back together will look at different headers thinking about roller cam but I like the flat trq curve that I have, with the cam I have now from 2500 to 5500 I have no less than 460 ft trq peak @3200 with 506 with a different cam I would like to see the curve just bigger #s
truck is
1997 2500hd
dana60 fr
dana 70 r
5.38 grears
nv4500
lackwood bell
centerforce clutch
6000#








































































moper said:
Stupid questions are those unasked.
Given the other parts - I'd think there's probably something else that's holding you back too. So I'd do some careful inspection if the heads are coming off anyway. Who spec'd the custom cam and is the valve job quality there? Reason I ask is I've used a Crane hydraulic with a similar intake lobe and made a lot more hp on a stock piston 440 with my ported 516 heads and a 6bbl.
Porting will help. It helped my 100% stock Neon and pretty much anything else it's done one. Assuming that the rest of the engine package is matched well and in good order and the porting is of good quality. The valve job can do a lot of what basic porting does if it's done with the right equipment by someone who wants to do a good job. It will also enhance any port work you pay for. So there may be more to getting more power than just porting. Make sure the rings are sealing (leakdown) and have the heads gone through a the same time. Then work with the head porter to match a new cam choice to what you have.
Click to expand...
76
MOPAROFFICIAL said:
Yeah that's the case sometimes. It just doesnt come off as it being the exhaust system that is responsibleas to why this thing isn't making more then mid 400's. Even seeing "triys"...lol..love the way some type, and that cam, speaking of which was ground with those in mind I'm thinking.

You hit it imo and I just caught it like the Tri Y thing, "2.14/1.81" .....wonder how much was blended, or not.
Bigger valves need bowl work flow well and or at least a good throat cut to not go the other direction ...that can be a killer.
Click to expand...
MOPAROFFICIAL said:
Yeah that's the case sometimes. It just doesnt come off as it being the exhaust system that is responsibleas to why this thing isn't making more then mid 400's. Even seeing "triys"...lol..love the way some type, and that cam, speaking of which was ground with those in mind I'm thinking.

You hit it imo and I just caught it like the Tri Y thing, "2.14/1.81" .....wonder how much was blended, or not.
Bigger valves need bowl work flow well and or at least a good throat cut to not go the other direction ...that can be a killer.
Click to expand...
 
Last edited:
jmaloy said:
hello
all numbers are at crank
mopar 2.14 and 1.88
duel comp springs
10 deg retainers and lock
cran gold race roller rockers
3/8 pushrods
edelbrock performer intake and 750 carb
kb hypereutectic piston with .170 quench
the engine has been setting for ten years was planning to go into check springs, replace if needed
figured I would either port are replace heads while thay were off
I would like to see more trq
as is I have a flat trq curve 2800 rpm 486trq,(3800 505trq peck),5000 450
Click to expand...
Just re-visited this thread, I hope You meant 2.14/1.81....not 1.88 exh valves, that is not a good plan esp. for 452 heads.
 
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