374 Stroker build
#1
374 Stroker build
Hey guys,
Did a Procomp headed 374 Small block yesterday. I'll post the dyno sheets but here are the specs;
4.125 DSS Racing forged piston
Scat 6.00" I beam rods
Base Procomp heads, no port or bowl work, 2.07/1.68.
Performer RPM with divider cut
Quick Fuel 735 VS carb 71/84 jets, (stock is 68/80). Reduced secondary HS air bleeds from 33 to 31.
9.5:1
Custom Lunati Hyd Roller, 223/231@.050 on a 112lsa
1.6 Stainless Roller rockers
5/16 .120 wall restricted pushrods
7qt. Canton deep pan
Melling HV pump with purple spring
330 crank stroked to 3.500
Internally balanced
Manifolds;
382hp/408tq
Headers;
411hp/430tq
Run on 89 octane with both exhaust systems blowing thru pipes and Magnaflow mufflers. Thanks!!
Did a Procomp headed 374 Small block yesterday. I'll post the dyno sheets but here are the specs;
4.125 DSS Racing forged piston
Scat 6.00" I beam rods
Base Procomp heads, no port or bowl work, 2.07/1.68.
Performer RPM with divider cut
Quick Fuel 735 VS carb 71/84 jets, (stock is 68/80). Reduced secondary HS air bleeds from 33 to 31.
9.5:1
Custom Lunati Hyd Roller, 223/231@.050 on a 112lsa
1.6 Stainless Roller rockers
5/16 .120 wall restricted pushrods
7qt. Canton deep pan
Melling HV pump with purple spring
330 crank stroked to 3.500
Internally balanced
Manifolds;
382hp/408tq
Headers;
411hp/430tq
Run on 89 octane with both exhaust systems blowing thru pipes and Magnaflow mufflers. Thanks!!
Last edited by cutlassefi; October 17th, 2017 at 02:24 PM.
#8
I did one to 5700 with an air cleaner installed. It quit making power at 5500.
If you look at the header dyno sheet you'll see less than 1 hp difference between 5400 and 5500. That normally tells you it's pretty much done.
Thank you for the thumbs up btw.
If you look at the header dyno sheet you'll see less than 1 hp difference between 5400 and 5500. That normally tells you it's pretty much done.
Thank you for the thumbs up btw.
Last edited by cutlassefi; October 17th, 2017 at 02:50 PM.
#11
#12
#13
Performer RPM divider cut?
Hey guys,
Did a Procomp headed 374 Small block yesterday. I'll post the dyno sheets but here are the specs;
4.125 DSS Racing forged piston
Scat 6.00" I beam rods
Base Procomp heads, no port or bowl work, 2.07/1.68.
Performer RPM with divider cut
Quick Fuel 735 VS carb 71/84 jets, (stock is 68/80). Reduced secondary HS air bleeds from 33 to 31.
9.5:1
Custom Lunati Hyd Roller, 223/231@.050 on a 112lsa
1.6 Stainless Roller rockers
5/16 .120 wall restricted pushrods
7qt. Canton deep pan
Melling HV pump with purple spring
330 crank stroked to 3.500
Internally balanced
Manifolds;
382hp/408tq
Headers;
411hp/430tq
Run on 89 octane with both exhaust systems blowing thru pipes and Magnaflow mufflers. Thanks!!
Did a Procomp headed 374 Small block yesterday. I'll post the dyno sheets but here are the specs;
4.125 DSS Racing forged piston
Scat 6.00" I beam rods
Base Procomp heads, no port or bowl work, 2.07/1.68.
Performer RPM with divider cut
Quick Fuel 735 VS carb 71/84 jets, (stock is 68/80). Reduced secondary HS air bleeds from 33 to 31.
9.5:1
Custom Lunati Hyd Roller, 223/231@.050 on a 112lsa
1.6 Stainless Roller rockers
5/16 .120 wall restricted pushrods
7qt. Canton deep pan
Melling HV pump with purple spring
330 crank stroked to 3.500
Internally balanced
Manifolds;
382hp/408tq
Headers;
411hp/430tq
Run on 89 octane with both exhaust systems blowing thru pipes and Magnaflow mufflers. Thanks!!
Tell me about cutting the divider in the Performer manifold. What are the benefits? Does it help low-end or top-end performance. How much is removed? Thanks
Rodney
#15
#16
I just dropped off a 1972 olds 350 to my machinist, he is doing short block tear down and build if is buildable. It was a 150 dollar craigslist find. It still had the nylon timing gear, never been opened up. I have been reading about these stroker builds using small journal chevy rods and offset grind the crank to 3.5. I would love to get a 370 olds, but have a budget of about 2,000 for the short block.
#18
The journals on the crank need offset ground and widened. Figure in that plus the cost of the 2" journal sbc rods and sbc 400 pistons. The rest will be normal machine work.
#19
That's a small cut. I see other manifolds that has a pre cut divider that has a larger cut than yours. Any benefits from that?
#21
Final numbers. Both were done after running the temps up a bit. Thinner oil means more power.
415 is 1" Wilson 4 hole tapered spacer. 417 is 1" open spacer. Any idea why they didn't make much of a difference?
Thanks.
415 is 1" Wilson 4 hole tapered spacer. 417 is 1" open spacer. Any idea why they didn't make much of a difference?
Thanks.
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