New L31 low vacuum question

[Hoosierlong90]

Paper clip is two steps ahead of useless.


I don't care about compression ratio. I want to know the cranking compression PRESSURE as an educated guess as to camshaft position--advanced or retarded from where it should be.


Are #5 and #7 AT LEAST half-an-inch apart EVERYWHERE they run next to each other?

Schurkey, I don't know the compression pressure right now.

Spark plug wires do indeed need to be straightened up because in fact they do touch before the dizzy, see pics.

On a side note I want to know where you found that sweet air cleaner spacer. I need a shorter than stock spacer for the proflow system on the G20 van and do not want to settle for a crappy plastic spacer.

I found the spacer on Amazon. They have them in several sizes.

How's that 395 run?


Thanks for the input guys. It is well appreciated!

 

[L31MaxExpress]

Schurkey, I don't know the compression pressure right now.

Spark plug wires do indeed need to be straightened up because in fact they do touch before the dizzy, see pics.


I found the spacer on Amazon. They have them in several sizes.

How's that 395 run?


Thanks for the input guys. It is well appreciated!

Ran decent in my Vortec powered Express.

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[PlayingWithTBI]

I found the spacer on Amazon. They have them in several sizes.

Is this the one you have?

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Do you have any clearance issue with the coil wires getting squashed by the air filter housing?

FYI - you s/b able to jack up your pressure to 20 PSI with that spring, that's what I'm running.

 

[Hoosierlong90]

Is this the one you have?

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Do you have any clearance issue with the coil wires getting squashed by the air filter housing?

FYI - you s/b able to jack up your pressure to 20 PSI with that spring, that's what I'm running.

No I bought this one but they are probably the same thing. No issues at all.

https://www.amazon.com/gp/aw/d/B0B295F6HW?psc=1&ref=ppx_pop_mob_b_asin_title

 

[L31MaxExpress]

Is this the one you have?

xc_hide_links_from_guests_guests_error_hide_media

Do you have any clearance issue with the coil wires getting squashed by the air filter housing?

FYI - you s/b able to jack up your pressure to 20 PSI with that spring, that's what I'm running.

On my 83 G20 van I used a 1" TBI spacer on a 3704 manifold and a stock 454 air cleaner without smashing the plug wires on a large cap HEI.

454 air cleaner has a bit of a power bowl built in and has a massive ~8" x 3.5" oval inlet.

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I just bought a 454 air cleaner on Ebay for the 87 G20. This one is off a RV and does not have the air prheater flap or inlet on it. The housing is the same as the TBI 454 vans though.

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I pull the goofy 200* baffle ring off the van air cleaners, it is merely epoxied into place from the factory. Clip on to it with vice grips, give it a good tug and it pulls right off. Removing that stupid baffle was worth nearly 10 rwhp on a near stock TBI 350 in my 83 van.

Only thing I need to find for the 87 is a factory 454 van air inlet duct. The factory 454 air cleaner is capable of flowing more than enough CFM to feed cooler outside air to the healthiest of small block builds.

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[PlayingWithTBI]

On my 83 G20 van I used a 1" TBI spacer on a 3704 manifold and a stock 454 air cleaner without smashing the plug wires on a large cap HEI.

I was talking about the 2-wire connector on the ignition coil which is mounted underneath the air cleaner. My 14" Edelbrock cleaner had a drop bottom which squashed them. I bought a Moroso flat bottom plate and now have enough clearance. If I go with that fancy spacer, I'll need to measure the difference with the OE one. Plus, the fancy one doesn't have a port for the breather hose going to the valve cover. But I do like how it looks

 

[Hoosierlong90]

I was talking about the 2-wire connector on the ignition coil which is mounted underneath the air cleaner. My 14" Edelbrock cleaner had a drop bottom which squashed them. I bought a Moroso flat bottom plate and now have enough clearance. If I go with that fancy spacer, I'll need to measure the difference with the OE one. Plus, the fancy one doesn't have a port for the breather hose going to the valve cover. But I do like how it looks

I'm using this air cleaner from Edelbrock with no problems. My coil may be positioned a little different than yours though due to different intake probably.

Edelbrock 43662 Edelbrock Pro-Flo High-Flow Series Air Cleaners | Summit Racing

Free Shipping - Edelbrock Pro-Flo High-Flow Series Air Cleaners with qualifying orders of $109. Shop Air Cleaners at Summit Racing.

www.summitracing.com

 

[PlayingWithTBI]

I'm using this air cleaner from Edelbrock with no problems. My coil may be positioned a little different than yours though due to different intake probably.

Edelbrock 43662 Edelbrock Pro-Flo High-Flow Series Air Cleaners | Summit Racing

Free Shipping - Edelbrock Pro-Flo High-Flow Series Air Cleaners with qualifying orders of $109. Shop Air Cleaners at Summit Racing.

www.summitracing.com

Yeah, I have the 43661 (blue) and it hits mine. Well, not anymore

Edit: I have the 3704 intake, maybe that's the difference?

 

[L31MaxExpress]

I was talking about the 2-wire connector on the ignition coil which is mounted underneath the air cleaner. My 14" Edelbrock cleaner had a drop bottom which squashed them. I bought a Moroso flat bottom plate and now have enough clearance. If I go with that fancy spacer, I'll need to measure the difference with the OE one. Plus, the fancy one doesn't have a port for the breather hose going to the valve cover. But I do like how it looks

I had a large cap HEI on mine, coil is inside the cap. I do not like the stock small cap HEI TBI distributor.

 

[Hoosierlong90]

How did you bump the fuel pressure up to 20?