Hmm. I may need to call speedmaster tomorrow and check before I buy valves then. I thought I read somewhere that they’re +.100” Chevy valves
ProComp/Speedmaster aluminum heads
- Thread starter j par
- Start date
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The Chevy intake valves that are plus .100 are 5.040 I believe. U can use them also as long as ur ex is the same length. Kim
valves are 5.010.......
PCE273.1049
Mopar Chrysler 318 360 2.020" +050 11/32" Stainless Steel Intake
Valves
PCE273.1050
Mopar Chrysler 318 360 1.600" +050 11/32" Stainless Steel
Exhaust Valves
35;40 a set of 8..
PCE273.1049
Mopar Chrysler 318 360 2.020" +050 11/32" Stainless Steel Intake
Valves
PCE273.1050
Mopar Chrysler 318 360 1.600" +050 11/32" Stainless Steel
Exhaust Valves
35;40 a set of 8..
If u put a longer valve in the valve tip gets farther away from the rocker making it too short. The sweep pattern is way off then. That’s why I used the 5.011 and 5.010. I have the 5.040 here. .030 doesn’t sound like much but the sweep pattern was way off. Kim
Looks like they are all closed chamber. How does that work with 10.5 340 pistons?
Just fine. I used a 8553 Fel pro and had the heads milled .030. Pistons were .013 above the block. Kim
Any recommendations on which retainers and locks? Or Should I wait until I have the springs and heads and see what the machine shop recommends? This is my first time having a set of heads set up so I’m pretty uneducated on all this.
Just a street engine for me. That had to be pretty high compression Kim. Was that the 65 cc?
PCE270.1005
1.400" Od. 1.060" Id. 7 Degree 11/32 Chromoly Steel Valve Spring
Retainers
PCE269.1002
10 Degree 11/32" Std Install Height Chromoly Valve Locks Keepers,,,,,,,,,,,WRong keepers
PCE
7 Degree 11/32" Std Install Height Chromoly Valve Locks Keepers...........out of stock....
Thanks Tony! One last question, you wouldn’t happen to know what the guide diameter is would you? May as well order seals right away too.
.500
Was, now 61.5 I believe
Looks like the valve seals and the PCE rocker arms are out of stock, so um gonna go ahead and order the heads, valves, locks, retainers and head stud kit. Hopefully the rockers come back in before the sale ends.
Yeah..... this making my head spin. LOL. ...I’m just gonna order the assembled heads and run ‘em. Just going on a stock stroke rebuilt 360 with speed pro hypereutectic pistons.
it’s going in an old truck.
it’s going in an old truck.
Btw, these are the valve springs I plan on installing. Still use that diameter retainer?
Other than weight savings, does anyone think I'd be wasting money buying these heads over my good flowing j head using 340 exhaust manifolds with good flowing exhaust with the appropriate camshaft? I know thats a little vague. Not set on gears yeat but I have 391 now with stock converter in my 67 fastback 340 ci
You are going to have to look at the retainers that fit your spring diameter....the retainers I use 1.40 ..I use with a 1.46 spring....they wont work with your spring.
j par
Well-hung Member
KISS...
j par
Well-hung Member
Don't forget to buy the stud kit while it's cheap...
So going off spring diameters and the retainer diameters, they have two different styles that would work for my springs. A flat retainer and a dished retainer.
1.250" Od. 0.870" Id. 7 Degree 11/32 Flat Chromoly Steel Valve Spring Retainers
1.250" Od. 0.870" Id. 7 Degree 11/32 Dish Chromoly Steel Valve Spring Retainers
SLOPAR72
Well-Known Member
Not so fast about Bolt them on and go. The set I bought went right to PRH and I am glad because the long term would have created problems. He may chime in and tell you what he found. Quite frankly I don't remember all the details and I don't need to. He is a strait shooter and they are now corrected without question and that's why I sent them there....
JW
Like almost any manufactured head. Send them off to get checked. But hey, they are real nice for the price and they are on sale NOW !!!!
SLOPAR72
Well-Known Member
No question it's a killer deal. They fit my needs. Plus PRH tuned them up a little since he had them. Personally though if I wanted to be a little more serious I would look at the Trickflows however that comes at a cost..... And even then I would probably not trust them OOTB lol....
JW
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