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2-barrel vs. 4 barrel on GPU
- Thread starter rjonesboy
- Start date
Hi and welcome to southern airboat,
Check the 5th post in this thread by waterthunder:
http://www.southernairboat.com/phpBB2/viewtopic.php?t=608&highlight=500+two+barrel
Jim
Check the 5th post in this thread by waterthunder:
http://www.southernairboat.com/phpBB2/viewtopic.php?t=608&highlight=500+two+barrel
Jim
hillrunnerfl
Well-known member
I agree with waterthunder.
One thing that has changed on later model 500 CFM Holleys is the check valve in the power valve line. It completly stops backfires from blowing the power valve.
I run a stock Holley 500 CFM and it works great. Keep in mind that motor is only going to use so much air. A 470 running 2900 RPMS is still below 500 CFM. Most four barrels with vacuum secondarys will not open the back two barrels because the motor does not need it. If you change it to mechanical and force it to open the back it will not run at high rpm's.
One thing that has changed on later model 500 CFM Holleys is the check valve in the power valve line. It completly stops backfires from blowing the power valve.
I run a stock Holley 500 CFM and it works great. Keep in mind that motor is only going to use so much air. A 470 running 2900 RPMS is still below 500 CFM. Most four barrels with vacuum secondarys will not open the back two barrels because the motor does not need it. If you change it to mechanical and force it to open the back it will not run at high rpm's.