35% off SpeedMaster
- Thread starter skrews
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skrews
Well-Known Member
What bench does that shop use?
Thanks for sharing ,what valves did you go with?
PRH
Well-Known Member
I definitely don’t feel you can compare numbers from different benches as “apples to apples”.
That being said........ the intake numbers look pretty decent...... the exhaust is a little weak.
Is that with the supplied valve job, or after some tweaking?
What did those cost again?
Have they ever tested an ootb RPM head for a SB Mopar, where the numbers could used as a comparison?
That being said........ the intake numbers look pretty decent...... the exhaust is a little weak.
Is that with the supplied valve job, or after some tweaking?
What did those cost again?
Have they ever tested an ootb RPM head for a SB Mopar, where the numbers could used as a comparison?
Iv'e said it before and I'll say it again. If I don't see 200 PLUS CFM at .300 its not going on any small block I build. I'll sacrifice a little up top (.700 and higher) if I have to.
PRH
Well-Known Member
Pretty good deal I’d say.
When you get them back, if they’re not assembled, I wouldn’t mind a few pics of the new valve job.
When you get them back, if they’re not assembled, I wouldn’t mind a few pics of the new valve job.
RAMM
Well-Known Member
Numbers @ .300 & .400" are really weak, that combined with the pretty strong high lift numbers lead me to believe these heads won't be great on most combos. However I really don't know as I've seen odd and contradictory results in the past. Good luck. J.Rob
PRH
Well-Known Member
Exactly.
And....... with that particular valve and valve job.
As always.......”YMMV”
Stock Edelbrocks from ShadyDell Speed
AS CAST OUT OF BOX
LIFT-----IN/EX
.100”----72.5/N/A
.200”--131.1/107.0
.300”--182.9/151.8
.400”--216.6/181.2
.450”--227.7/182.9
.500”--235.9/185.6
.550”--238.7/185.6
.600”--242.2/185.6
.650”--243.2/185.6
.700”--243.2/185.6
AS CAST OUT OF BOX
LIFT-----IN/EX
.100”----72.5/N/A
.200”--131.1/107.0
.300”--182.9/151.8
.400”--216.6/181.2
.450”--227.7/182.9
.500”--235.9/185.6
.550”--238.7/185.6
.600”--242.2/185.6
.650”--243.2/185.6
.700”--243.2/185.6
PRH
Well-Known Member
Tested on my bench in 8/17, an unported Speedmaster SB head, ootb, on a 4.00 bore was 261/167@.600 lift.
I think John Cadamore had one on his bench at some point as well.
I think John Cadamore had one on his bench at some point as well.
No I never tested a Speedmaster Head. I did a write-up on a set of ProMax and Edelbrock heads and the ProMax head flowed way better and the quality was 10 times better than the crap Edelbrock is shoving out the door now. On my bench my out of the box flow numbers are almost identical to Ryan’s at Shadydale Racing. 243 max flow. I’ve maxed out at 318 cfm with a 2.08 valve so far (stay tuned).
PRH
Well-Known Member
What did the Promaxx head flow?
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gzig5
Well-Known Member
I can't find where/if you specified in that thread, was that with the stock MAXX 171 version or the Shocker 185 CNC version? The ProMAXX site says the 171 will do 254@.600" on the intake and the 185 CNC is at 284@.600". Your result on your bench was in the middle, 264@.600".
Maxx 171 SB Mopar (Sold in Pairs) - PROMAXX Performance Products
Shocker 185 Mopar CNC (Sold in Pairs) - PROMAXX Performance Products
that was a stock 171 version. The shocker wasn't released yet back then.
cookietruck
Well-Known Member
damn, the promaxx heads are a deal.
gzig5
Well-Known Member
What's the deal with the 63 and 65 cc chambers? Looks like the 65 is a little more of an open chamber design? That small difference in volume won't be much over 0.2 points of compression will it, even with the piston out of the hole a little?
Probably just like Edelbrock offers so you can bolt the 65 cc on a 340 engine and clear the pistons
skrews
Well-Known Member
Mopar Chrysler SB 318 340 360 170cc 65cc Cast Bare Aluminum Cylinder Head 12933010742 | eBay
$357 each for bare castings
$357 each for bare castings
Are you going to buy a set. or are you just a salesman.
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