What kind of cam were you running to shift at > 4900 and what were the overall improvements because of your port work? 
Porting pictures, base and SR
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
The SR was definitely part of it, though I'm using stock ported heads with large valves as well. When I swapped them I put on 1094 thinner head gaskets and 1.6 rockers too.
Stock 113s:
Ported 113s:
Stock 113s:
Ported 113s:
Last edited by Aardwolf; Jan 29, 2010 at 07:55 PM.
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
It was the stock long block, ported stock 113 heads, untouched short block with the '88 cam. I did some limited testing on shift points at the drag track. It was difficult to get in enough runs to really narrow it down.
Pro
Joined: Feb 2005
Posts: 654
Likes: 4
Are you lookin to rebuild? I have a 355 and i have a 224-230 mid 500 lift cam to put in it....also lookin for some heads like AFRs. with that said would you say i should go ahead and do the port work to open everthing up on the SR or leave it stock?
---i didnt see you had a stock cam wow. so if you gained from portin the SR i guess i should see better performance with my setup if i port mine...
---i didnt see you had a stock cam wow. so if you gained from portin the SR i guess i should see better performance with my setup if i port mine...
Last edited by 355tpipickup; Jan 29, 2010 at 10:52 PM.
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
Yes I'm rebuilding it over the winter. The block was bored this week.
I would say with that combo you'd want to port it for more high RPM flow. That duration is pushing the RPM band up, the AFR's will flow there, so the intake must keep up. The base needed the most help. Check TGO too for porting results.
I would say with that combo you'd want to port it for more high RPM flow. That duration is pushing the RPM band up, the AFR's will flow there, so the intake must keep up. The base needed the most help. Check TGO too for porting results.
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
This SR had some stripped threads. I simply drilled the bad ones out and used bolts. I staked the nuts and used locktite, plus lock washers. Be aware of the risk from a nut going down the intake. I "nut and bolt" the car quite a lot and they are easy to check.
Le Mans Master
Joined: Feb 2005
Posts: 6,482
Likes: 566
From: Clearwater Florida
Thats a LOT of work ... I know , I did a tuned port gasket match and , counting the throttle body , theres 41 holes to " massage " , I couldnt afford to have paid a buck an hour for the time I spent breathing aluminum dust and then after that , waiting for some sensation to return to my hand .... good vibrations .... Atta-Boy
