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Holley Stealth Ram Thermostat Cover

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Old 06-25-2019, 01:15 PM
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Holley Stealth Ram Thermostat Cover

Hello, does anyone have a suggestion on T stat cover on a Holley Stealth Ram? It's an 88 Iroc with serpentine belt and its seems the bolt hole angle on HSR screws with angle of hose. TPI neck wrong angle, Aftermarket adjustable with 15 degree (rcp 6015) neck to tall and hits underside of throttle body, on top of the fact upper radiator hose diameter is to small.....any suggestions?

Thanks in advance
Old 06-25-2019, 01:17 PM
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Car: 1967 Camaro, 91 z28
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Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Holley Stealth Ram Thermostat Cover

Does one from a carb or tbi thirdgen work ?
Old 06-25-2019, 01:55 PM
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Re: Holley Stealth Ram Thermostat Cover

Hmm enlightening!! I forgot they did make a tbi motor in that year. I'll check but am betting the bolt pattern is parallel to front of block and for some reason Holley chose to offset them.
Old 06-25-2019, 02:05 PM
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Re: Holley Stealth Ram Thermostat Cover


Just a guess that it might work.

Last edited by Tuned Performance; 06-25-2019 at 02:09 PM.
Old 06-25-2019, 02:25 PM
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Re: Holley Stealth Ram Thermostat Cover

Well Thank you soooo much this has been driving me nuts. Ill try that RS housing it looks to be at eh correct angle!
Old 06-25-2019, 02:37 PM
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Car: 91 Z28 - using 87 electricals
Engine: 383 HSR EBL
Transmission: 700R4 - Stage 3 Fixed Pressure
Axle/Gears: GM 3.08 POSI
Re: Holley Stealth Ram Thermostat Cover


I used Mr gasket part number 2661 and it worked fine it was a little wider than the hose but it worked well everything's good.


Last edited by Green89IROC305; 06-25-2019 at 02:50 PM.
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Old 06-25-2019, 06:31 PM
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Re: Holley Stealth Ram Thermostat Cover

Thanks man Ill I was going to ask if you're hood shut with the HSR but I see your cross brace is cut. How's she run?
Old 06-25-2019, 06:42 PM
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Car: 91 Z28 - using 87 electricals
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Re: Holley Stealth Ram Thermostat Cover

Originally Posted by scott1320
Thanks man Ill I was going to ask if you're hood shut with the HSR but I see your cross brace is cut. How's she run?

Yeah I had to cut part of the hood out because the hood was hitting the throttle body. The HSR not fitting might have been a combination of things such as my chosen engine mounts. However the hood wasn't cut much here is a pic. Still need to clean things up all over. So many little things...



It runs okay, not fully tuned yet. Sounds good though.
I need to swap the 42# injectors for 36# injectors tomorrow and retune it all over again.

Good luck with your swap! If you have any questions I may be able to answer, feel free to PM me.
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