Accel /Edelbrock base intake manifold
Thread Starter
Instructor
Joined: Dec 2005
Posts: 142
Likes: 2
From: Centerport NY
Accel /Edelbrock base intake manifold
I have been planning ( forever) the mods on my ' 90 and what I have left if a mega ported plenum, mega ported SLP runners and 1.6 RRs.
Without doing the heads and the cam (48MM TB) will the stock intake manifold provide enough flow for the ported plenum and SLPs to feed the heads with the 1.6 RRs or will the stock intake manifold become the restricting section?
If I do heads in the future the manifold will have to come off anyway so if there is no real benefit to an Accel/Edelbrock intake manifold at this point I would leave it.
Any links I could get the flow #s from ??
Without doing the heads and the cam (48MM TB) will the stock intake manifold provide enough flow for the ported plenum and SLPs to feed the heads with the 1.6 RRs or will the stock intake manifold become the restricting section?
If I do heads in the future the manifold will have to come off anyway so if there is no real benefit to an Accel/Edelbrock intake manifold at this point I would leave it.
Any links I could get the flow #s from ??
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If the SLP runners have larger port dia than the stock base you might benefit from the Accel base now, not sure. The stock runners seem to be the biggest restriction to high RPM flow.
The stock base will flow about 223cfm; stock runners flow about 203cfm.
The stock base will flow about 223cfm; stock runners flow about 203cfm.
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
This might be controversial, but I found the Accel piece to have much bigger ports/tracts than the Ed.
I had both at the same time(on the work bench) to compare.
The Ed was very close to stock from what I could see.
(I had the stock manifold sitting next to the other two)
I had both at the same time(on the work bench) to compare.
The Ed was very close to stock from what I could see.
(I had the stock manifold sitting next to the other two)
Racer
Joined: Dec 2007
Posts: 298
Likes: 1
From: Escondido CA
This might be controversial, but I found the Accel piece to have much bigger ports/tracts than the Ed.
I had both at the same time(on the work bench) to compare.
The Ed was very close to stock from what I could see.
(I had the stock manifold sitting next to the other two)
I had both at the same time(on the work bench) to compare.
The Ed was very close to stock from what I could see.
(I had the stock manifold sitting next to the other two)
I wouldnt go as far to say the edelbrock is very close to stock though!
By the way, did you notice both have the same casting # on bottom???
Anyhow, If you are going to replace either your runners or baseplate, I would suggest doing the baseplate first...
Last edited by neverendingprojects; Apr 22, 2008 at 11:31 PM.
Thread Starter
Instructor
Joined: Dec 2005
Posts: 142
Likes: 2
From: Centerport NY
So if the stock heads flow @ 195cfm @ .5+ inch lift ( 1.6 RRs) then the stock base can provide enough flow (?)
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
So if the stock heads flow @ 195cfm @ .5+ inch lift ( 1.6 RRs) then the stock base can provide enough flow (?)
Now, if those SLP runners are siamesed your power band will likely change but that's another issue.
I went in the opposite direction, i.e. I kept the stock runners and siamesed the base about 2" in from the runner interface. The result was a much flatter power band with nice extension well into the 5k RPM range.
Safety Car
Joined: Apr 2002
Posts: 3,531
Likes: 1
From: Conroe TEXAS!
Cruise-In X Veteran
Yes sir, that would be my take on it.
Now, if those SLP runners are siamesed your power band will likely change but that's another issue.
I went in the opposite direction, i.e. I kept the stock runners and siamesed the base about 2" in from the runner interface. The result was a much flatter power band with nice extension well into the 5k RPM range.
Now, if those SLP runners are siamesed your power band will likely change but that's another issue.
I went in the opposite direction, i.e. I kept the stock runners and siamesed the base about 2" in from the runner interface. The result was a much flatter power band with nice extension well into the 5k RPM range.
My setup is different though. TPIS base and SLP runners (just cleaned up the castings). "home ported" plenum, and 52mm TB. I think the TB was probably overkill on a stock motor...but oh well..
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I think the TB was probably overkill on a stock motor...but oh well..
Yea it sure is nice being able to pull well close to 6k RPM...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
