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Old 12-15-2021, 04:06 PM
65sport 65sport is offline
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Default HEI large cap vs small cap with Pertronix, EP4B intake manifold.

1. Will an HEI clear an EP4B ? (64 Pontiac engine).

2. If it won't, will the small cap distributor allow enough mechanical/vacuum advance combined without slipping out of phase on a low compression engine tuned for city, highway or some spirited occasions.?

I would prefer to run the HEI, but would like to know if it'll clear before I buy it. I've heard the old P4B's (65 and up) would not.
But the EP4B is a lower profile manifold.

Thanks in advance (pun intended).

  #2  
Old 12-15-2021, 06:24 PM
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Formulas Formulas is offline
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i have the square bore P4B Holley carb moroso air cleaner on 1969 #48 heads on a 350 block with HEI no problems

Do you have firewall clearance?

It might not have much to do with manifold height but more to do with carb / runner placement front to rear or spreadbore vrs square


Last edited by Formulas; 12-15-2021 at 06:33 PM.
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Old 12-15-2021, 08:16 PM
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Bruce Meyer Bruce Meyer is offline
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There are a few different versions of the P4B. The square bore P4B that Formulas mentions looks pretty much exactly like a factory iron manifold except its for square bore carbs. HEI will fit these. Some of the other ones have very wide ports that will interfere with an HEI.
Post a pick of your manifold and I can tell you right away if an HEI will fit.

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Old 12-15-2021, 10:08 PM
65sport 65sport is offline
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Plenty of firewall clearance.

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Old 12-15-2021, 10:20 PM
65sport 65sport is offline
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Quote:
Originally Posted by Bruce Meyer View Post
There are a few different versions of the P4B. The square bore P4B that Formulas mentions looks pretty much exactly like a factory iron manifold except its for square bore carbs. HEI will fit these. Some of the other ones have very wide ports that will interfere with an HEI.
Post a pick of your manifold and I can tell you right away if an HEI will fit.
Here it is, EP4B 61-64.
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Old 12-15-2021, 10:26 PM
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Bruce Meyer Bruce Meyer is offline
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Quote:
Originally Posted by 65sport View Post
Here it is, EP4B 61-64.
That's the wide port version. An HEI wont fit.

  #7  
Old 12-15-2021, 10:30 PM
65sport 65sport is offline
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Quote:
Originally Posted by Bruce Meyer View Post
That's the wide port version. An HEI wont fit.
I was afraid of that.

Pertronix here we come.

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