1qwk767 Posted December 8, 2005 Report Share Posted December 8, 2005 My g/fs little brother drives a 84 monte with a 305, and he wanted to keep an eye on the motor so we went to advanced auto and bought the 3-pack of sunpro guages, oil,volts,temp well the motor seems to run strong all the time, but here recently ive noticed the oil psi to be around 40psi on a cold start and drop to like 20 when full warmed up, then to like 10-15psi in gear, when he drives the car and gets on it the oil pressure barely goes above 25psi, this puzzles me the car has vavoline 10w30 in it and im wondering if the motor is gettin ready to go, if anyone has any suggestion let me know Thanks In Advance Mark Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted December 8, 2005 Report Share Posted December 8, 2005 10psi for every 1000rpms is a good benchmark for SB Chevy engines. How many miles on the motor, and what brand of guages? Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 9, 2005 Report Share Posted December 9, 2005 ive seen 305s run with as little as 5 psi in gr at idle. but yes the motor is wearing out. most good stock enginges well at least sbc's idle arround 20 hot. but shouldent drop below that. if he is interested in building a 350 i got a good 4 bolt 350 block. needs bored to 60. just let me know . Quote Link to comment Share on other sites More sharing options...
1qwk767 Posted December 9, 2005 Author Report Share Posted December 9, 2005 10psi for every 1000rpms is a good benchmark for SB Chevy engines. How many miles on the motor, and what brand of guages? in answer to your question the guages are sunpro and the motor has around 99k miles ive seen 305s run with as little as 5 psi in gr at idle. but yes the motor is wearing out. most good stock enginges well at least sbc's idle arround 20 hot. but shouldent drop below that. if he is interested in building a 350 i got a good 4 bolt 350 block. needs bored to 60. just let me know . allright thanks and how much are you looking to get for the 350 block im interested in the block myself and thanks for the responses guys I really appreciate it Mark Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 9, 2005 Report Share Posted December 9, 2005 i figure i know its a good block but it does need bored to .060. is 50 bucks good price? Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted December 9, 2005 Report Share Posted December 9, 2005 Before he spends money on anything, swap out the filter with a new NAPA filter and change the oil. If it's still reading low, try to borrow another oil guage to double check the Sunpros. They used to be good guages, but I assume he bought the small, cheap plastic guages? The set of cheap Sunpros I had (came in car) read very differently than the Auto Meter Ultra Lites that replaced them. Maybe worth a try. Quote Link to comment Share on other sites More sharing options...
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