I'm trying to save $ on my 400 To 451 or 470 build I plan to Port some 452 heads, get her going and bolt on some Trick flow heads later
I'm hoping for 280 cfm at .550
I'm hoping for 280 cfm at .550
Amount of CFM available from 452 heads, heavily ported
- Thread starter Brooks James
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The question is... Do you know what you are doing? Moparts on the Web - Main Index
That kinda flow ain't cheap. Think 2K or more. Get the Trick Flows.
I have two sets , practice on one
I'm prepared to research it , buy the tools, and ask advice
For 45 yrs I've wanted to Port heads
I'm prepared to research it , buy the tools, and ask advice
For 45 yrs I've wanted to Port heads
Maybe someone has reported their work on '452's to Stan Weiss' site; have a look
Automotive Performance Software / Interactive Calculators (erols.com)
Automotive Performance Software / Interactive Calculators (erols.com)
Well good luck with it and keep us posted!
Moparts...
452 ported, no polishing,
No back cut on valves
269/168 @ .600
Will work for me
452 ported, no polishing,
No back cut on valves
269/168 @ .600
Will work for me
Rat Bastid
Dunamis Metron
At least not for 45 years doing it every day, plus flow bench time, plus dyno testing, plus track time etc.
Stock heads can be made to work. Not the heads in question but my old 906 heads ran 9.82 in my 1974 duster back in the late 1980’s. Old two piece 3/8 valves too as we didn’t have a lot of fancy parts back then.
Are You doing this with stock valve sizes or?
What cam specs & rockers?
Target squeeze?
Who is, or how are You, checking Your work?
Those quoted #'s are short on the exh. side, to Me. All-out 452's have gone 320's with large intake valves, but there's a LOT of work to get there, not cliff notes porting territory for sure.
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Friend of mine just did a set of 516's that went 295 @ 650 with a 2.14 valve.
Carnut68
Well-Known Member
You could Edelbrock E street heads for 1400 pr.
PRH
Well-Known Member
Might as well see if it’s as fun as you think it is.
PRH
Well-Known Member
I wrote the previously referenced archived thread on moparts.
As well as:
Moparts on the Web - Main Index
And
Moparts on the Web - Main Index
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You would be better served ordering up a set from Aerohead and breaking out the burrs.
But there’s nothing better than getting it right and saying with a smile, yea, I did that. I figured it out.
Carnut68
Well-Known Member
Update they are 1517.00 per pair @ Summit. $300 jump in 2 years. I learned my lesson messing with iron heads, cost me a tear down and rebuild because they cracked.
PRH
Well-Known Member
It’s funny you say that.
I had someone send me a set of those a while back that they had been running.
They had opted for the 2.14/1.81 valve upgrade, but not any porting.
The bowl cutter they used for bringing the bowls out to the appropriate size for the larger valves resulted in a very pronounced sharp edge on the short turn........ and the result of that was heads that flowed slightly worse than untouched OE heads.
This particular set were 452’s.
With a little porting they came around though.
Edit-
Dug through my notes...... here is the flow as rec’d:
452, 2.14/1.81, 4.375 bore, 28”:
Lift———I/E
.100—- 66/53
.200—-116/95
.300—-167/125
.400—-196/139
.500—-217/142
.600—-222/143
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PRH
Well-Known Member
A proper valve job and basic bowl blend will get a set of Stealths into the 280 range.
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PRH
Well-Known Member
Regarding the heads in post #22...... in terms of BB Mopar heads.......if the choice is bigger valves ........ or........ a little well executed bowl/pinch work....... take the porting.
Doing both is best, but if you can only have one...... the porting wins.
Here is a test on a 346 head(same intake port as a 452).
-recondition seat(stones)
-reface OE valve, add back cut
-blend bowl & SSR, bullet nose guide boss
-open pinch to 1.060”
Lift———I/E
.100—- 70/56
.200—-143/103
.300—-207/137
.400—-237/163
.500—-251/177
.600—-260/185
Doing both is best, but if you can only have one...... the porting wins.
Here is a test on a 346 head(same intake port as a 452).
-recondition seat(stones)
-reface OE valve, add back cut
-blend bowl & SSR, bullet nose guide boss
-open pinch to 1.060”
Lift———I/E
.100—- 70/56
.200—-143/103
.300—-207/137
.400—-237/163
.500—-251/177
.600—-260/185
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PRH
Well-Known Member
And a fully ported, but not “max effort” 346 with 2.14/1.81 valves.
I believe these heads have gone 122 or 123 in the 1/4 in a full bodied Challenger running bias ply repro tires and through ex manifolds(FAST legal):
Lift———I/E
.100—- 70/56
.200—-147/112
.300—-211/152
.400—-245/188
.500—-269/204
.600—-278/211
.700—-282/215
I believe these heads have gone 122 or 123 in the 1/4 in a full bodied Challenger running bias ply repro tires and through ex manifolds(FAST legal):
Lift———I/E
.100—- 70/56
.200—-147/112
.300—-211/152
.400—-245/188
.500—-269/204
.600—-278/211
.700—-282/215
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